Cushioning device for printing-machines



(No Model.)

- C. PTTBR, JI.

GNSEIONING DEVICE .EGE PRINTING MACHINES. No. 358,568. Patented Mam'. l, 1887.

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N, PETERS. FholwLimogrnphur, washingmn, D4 C.

' compress the air in cylinders that are underilNITED STATES Partnr @tirreno CHARLES POTTER, JR., OF PLAI'NFIELD, NEWT JERSEY.

CUSHIONING DEVICE FOR PRlNTlNG-MACHlNES.,

SPECIFICATION forminggpart of Letters Patent No. 358,568, dated March 1, 1887.

Application filed March 24, 11394` .Tc all whom it may concern;

Beit known that I, CHARLES POTTER, J r., of Plainfield, in the county of Union and State of New Jersey, have invented a new and useful Improvement in Oushioning Devices for Printing-lvachines; and the following is declared to be a description of the same.

In printingpresses pistons are employed to neath the reciprocating type-bed, such compression serving to aid in stopping the momentum ofthe type-bed in one direction, and also aiding the first part of the movement in theotherdirection. Variousdeviceshave been employed to accomplish this purpose.

My invention relates to a device for accomplishin g this obj ect; and it consists in the combination, with the aircushioning cylinder having a central partition, of a disk of leather, rubber, or other ilexible materiahand a springarm at each side of such partition. The spring"- arrns and llexible disks are secured to the central partition by a bolt, and said arms are bent outwardly and downwardly, and the lower end of each is slotted for the passage of abolt, which also passes through the flexible disk, and said flexible disk is, by means ofthe springarm and bolt, kept in a normal position away from the central partition, so that the'opening in the same allows the escape of air. These disks of flexible material act-as valves for closing the opening in the central partition in opposite directions, preventing the escape of air whenever the speed of movement of the typebed and the rush of air toward such valve is sufficient to overcome the spring and canse the valve to close. The confined air then acts as a cushion to overcome the momentum of the bed in stopping and starting the same.

In the drawings, Figure l is a longitudinal section of type-bed and cylinder, and Eig. 2 is a cross-section at the line x x.

rllhe frame A of the priuting-press and the pistons B may be of any desired shape or construction, and the type-bed C is provided with air-cushioning cylinders D beneath it. The

center partition, a, between cylinders D has an opening for the passage of air from either side.

The b are made of leather, rub- Serial No. 125,277. (No model.)

ber, or other flexible material, and are secured to the partition a by a bolt or bolts, c. The spring-arms d d/ are also secured to the partition a by the same bolt or bolts c, and washers c may be employed under the heads of the bolt c.

The spring'arms d el are preferably made of the shape shown in Fig. l, and their lower ends are slotted, and I employ bolts e c', that are secured to the disks bib and pass through the slots in the arms d d, the object of said spring-arms and bolts being to keep the disks b b in a normal position away from the partition a, the arms, however, yielding to pressure.

The pressure exerted by the ai r within either of the cylinders D against the surface of the disk b or D will be greater or less, according to the rate of speed at which the type-bed is traveling. The higher the speedA the sooner the air will press the disk against the partition and close the escape of the air-,and the greater the cushioning action, and vice versa. This cushioning action will be in proportion to the rate of speed of the reciprocating typebed; hence the operation is automatic and very efficient. Vhen the press is being turned slowly by hand, the rush of air will not be'su ficient to overcome the spring of the valve; hence the valve will remain open and the air will not act as a cushion.

The cylinders may be attached to the frame and the pistons and rods to the bed, if desired, the valves and springs for each cylinder being made as before described and applied over the hole in the cylinder end.

I claim as my inventionl. The combination, in a printing-press, I

with the stationary pistons and reciprocating type-bed, of aircylinders beneath the bed, a partition between said cylinders, said partition having an opening therein, disks of tlexible material, and spring-arms at each side of and secured to the partition, bolts connecting the disks and spring-arms, so that the springarms act to move the disks away from the partition, as and for the purposes set forth.

2. The combination, with the reciprocating type-bed in a printing-press, of a piston and an air cushioning cylinder, there being an .opening in the partition 01. end 0f the Cylin- I Signed by me this 19th day 0fMa1Ch,A. D.

der, a disk Within the cylinder covering the 1884. opening, a spring-arm, and a connection7 substantially as described7 between the end of .CHARLES POTTER, JR. the spring-arm and the disk, whereby the disk is drawn away by a yielding force that allows Vitnesses:

the disk to close the opening by an accumu- GEO. T. PINCKNEY,

lated air-pressure, substantially as set forth. HAROLD SERRELL. 

